Update the head ref to changelog verifier (#4296)

[kotwanikunal]

• Update changelog contribution guide

Signed-off-by: Kunal Kotwani kkotwani@amazon.com

• Fix reference to pull request

Signed-off-by: Kunal Kotwani kkotwani@amazon.com

Signed-off-by: Kunal Kotwani kkotwani@amazon.com
(cherry picked from commit 5dd7947)

Description

• Backports Update the head ref to changelog verifier #4296 to 1.x

Issues Resolved

• N/A

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/2205/
• CommitID: b2a327e

[codecov-commenter]

Codecov Report

Merging #4327 (b2a327e) into 1.x (10280ef) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                1.x    #4327      +/-   ##
============================================
+ Coverage     77.84%   77.85%   +0.01%     
- Complexity    63398    63410      +12     
============================================
  Files          4453     4453              
  Lines        275009   275009              
  Branches      41172    41172              
============================================
+ Hits         214084   214113      +29     
- Misses        43971    43980       +9     
+ Partials      16954    16916      -38     

Impacted Files	Coverage Δ
...earch/index/engine/FlushFailedEngineException.java	50.00% <0.00%> (-50.00%)	⬇️
...ch/transport/ReceiveTimeoutTransportException.java	50.00% <0.00%> (-50.00%)	⬇️
.../action/ingest/SimulatePipelineRequestBuilder.java	0.00% <0.00%> (-50.00%)	⬇️
...x/snapshots/IndexShardSnapshotFailedException.java	33.33% <0.00%> (-33.34%)	⬇️
.../java/org/opensearch/index/merge/OnGoingMerge.java	71.42% <0.00%> (-28.58%)	⬇️
...opensearch/transport/TransportResponseHandler.java	75.00% <0.00%> (-25.00%)	⬇️
...pensearch/index/shard/SearchOperationListener.java	75.53% <0.00%> (-23.41%)	⬇️
...lucene/index/SequentialStoredFieldsLeafReader.java	77.77% <0.00%> (-22.23%)	⬇️
...bucket/histogram/ParsedVariableWidthHistogram.java	52.80% <0.00%> (-20.23%)	⬇️
...arch/aggregations/bucket/filter/ParsedFilters.java	67.27% <0.00%> (-18.19%)	⬇️
... and 444 more

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